Haibara Katsumi is a 17 year old young man who has a cute and beautiful face. His mother died long ago and his father was busy working, so he was raised by his four older sisters. His older sisters often dressed him up as a woman because of Katsumi's beautiful face and he was often mistaken for a woman on the street. This makes their father angry and moves Katsumi to an all-boys school and when you first meet him, you mistake him for a girl.